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Thank you all for your kind suggestions. This is a road trip with camping, and I have a national parks pass. I haven't been thru these parts since I was 12 and I'm 52 but I do many road trips, primarily thru California, AZ and OR. I am nature-oriented and really looking forward to revisiting these states.

There are different ways for you to go. One way is to go on I-15 through Idaho to Montana, then go west on I-90 to Coeur d'Alene. If you go this way, there a nice national forest campground around Spencer, Idaho (fills up on weekends). Just before you get to Dillon, Mont. you can go on 278 to the ghost town of Bannack (campground there) & then go 43, and 93 to Missoula (campgrounds on 93). If you want to stay on the freeway go I-15 to 90 to get to Missoula & continue on 90 to your destination. Deer Lodge has a prison/car museum in town & a KOA. Either route goes through a lot of national forests, so I'd check for campgrounds on the web site Reserve America or other sites. You'll probably only need reservations on the weekends but be aware July 24th is a holiday in Utah. Have a great trip!

If you follow annieO's itinerary along I-15 and US 93 or I-90 I second her suggestion to stay at Bannack.
The campground and the whole setting of the ghost town are really nice.
Once you get to Missoula, you can do a short detour up North on 93/200/212 to do the loop drive thru the National Bison Range.